根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。每个选项限选一次。
Teacher: What do you want to do in your future?
Lily: I like shopping and talking to people. ____ Maybe selling clothes is a good business for me.
Ryan: My hobbies are playing computer games and making friends online. ____ I guess I will learn more about computers and make super-smart computer programs.
Bill: My parents have kept lots of pets since I was little. ____ Those stories have always stayed in my mind. One day, I will share them with people by drawing and writing books.
Anna: Though my mom and two sisters are all doctors, I'm sure I will stay as far away from a hospital as I can. ____ I'll keep strong by playing my favorite sport, tennis, every day. One day I'll join the national team.
A. I think I can learn how to do business. B. We often share our funny stories by e-mail. C. I'm afraid of seeing sick people looking weak.
D. We've experienced many things together, happy and sad.
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反应如下表，据此判断激素a、b、c的化学名称依次是 
c激素